ABC COMPUTER COMPANY, LTD. A4879 Processor 80486SX/80487SX/80486DX Processor Speed 25/50MHz Chip Set UMC Max. Onboard DRAM 64MB SRAM Cache 64/128/256KB BIOS AMI Dimensions 220mm x 330mm I/O Options None NPU Options 4167 [Image] CONNECTIONS Purpose Location Purpose Location Power LED & keylock J1 Reset switch J4 Speaker J2 Turbo LED J5 Turbo switch J3 External battery J6 USER CONFIGURABLE SETTINGS Function Jumper Position » Monitor type select color W18 closed Monitor type select monochrome W18 open » Battery type select internal W22 closed Battery type select external W22 open SRAM JUMPER CONFIGURATION Jumper 64KB 128KB 256KB W2 pins 1 & 2 pins 2 & 3 pins 2 & 3 closed closed closed W3 pins 1 & 2 pins 1 & 2 pins 2 & 3 closed closed closed W4 open pins 2 & 3 pins 2 & 3 closed closed W5 pins 1 & 2 pins 1 & 2 pins 1 & 2 closed closed closed W6 open closed closed W7 open open closed W8 open open closed W9 open closed closed SRAM CONFIGURATION Size Cache SRAM Location TAG (U10) TAG (U11) 64KB (8) 8K x 8 Banks 0 & 1 (1) 16K x 4 (1) 8K x 8 128KB (4) 32K x 8 Bank 0 (1) 16K x 4 (1) 32K x 8 256KB (8) 32K x 8 Banks 0 & 1 (1) 16K x 4 (1) 32K x 8 CPU JUMPER CONFIGURATION CPU Jumper W10 Jumper W11 Jumper W14 80486DX pins 1 & 2 pins 1 & 2 and 3 & open closed 4 closed 80487SX pins 2 & 3 pins 1 & 2 and 3 & closed closed 4 closed 80486SX open pins 2 & 3 closed closed Note:The location of W14 is unknown. DRAM CONFIGURATION Size Bank 0 Bank 1 Bank 2 Bank 3 Jumpers W12,W13,W15,W16 1MB (4) NONE NONE NONE pins 1 & 2 closed 256K x 9 1MB NONE NONE (1) 256K NONE pins 2 & 3 closed x 36 2MB (4) (4) NONE NONE pins 1 & 2 closed 256K x 256K x 9 9 2MB NONE NONE (1) 256K (1) 256K pins 2 & 3 closed x 36 x 36 3MB (4) (4) (1) 256K NONE pins 1 & 2 closed 256K x 256K x x 36 9 9 4MB (4) (4) (1) 256K (1) 256K pins 1 & 2 closed 256K x 256K x x 36 x 36 9 9 4MB (4) 1M NONE NONE NONE pins 1 & 2 closed x 9 4MB NONE NONE (1) 1M x NONE pins 2 & 3 closed 36 5MB (4) (4) 1M NONE NONE pins 1 & 2 closed 256K x x 9 9 8MB (4) 1M (4) 1M NONE NONE pins 1 & 2 closed x 9 x 9 8MB NONE NONE (1) 1M x (1) 1M x pins 2 & 3 closed 36 36 12MB (4) 1M (4) 1M (1) 1M x NONE pins 1 & 2 closed x 9 x 9 36 16MB (4) 1M (4) 1M (1) 1M x (1) 1M x pins 1 & 2 closed x 9 x 9 36 36 16MB (4) 4M NONE NONE NONE pins 1 & 2 closed x 9 16MB NONE NONE (1) 4M x NONE pins 2 & 3 closed 36 20MB (4) 1M (4) 4M NONE NONE pins 1 & 2 closed x 9 x 9 32MB (4) 4M (4) 4M NONE NONE pins 1 & 2 closed x 9 x 9 32MB NONE NONE (1) 4M x (1) 4M x pins 2 & 3 closed 36 36 48MB (4) 4M (4) 4M (1) 4M x NONE pins 1 & 2 closed x 9 x 9 36 64MB (4) 4M (4) 4M (1) 4M x (1) 4M x pins 1 & 2 closed x 9 x 9 36 36 Note:The locations of jumpers W12, W13, W15,and W16 are unknown.